In this work the preparation of activated carbon using as raw matterials the solid product of the pyrolysis of shells of the fruit of Honduran mahogany and mammee seeds is studied by “physical” activation with steam water. The properties of the different activated carbons are analyzed by the realization of chemical characterization, proximate and elementary analysis, and chemical – physical analysis, methylene blue and iodine indexes and kinetic curve of adsorption of methylene blue at 25°C. The influence of different temperatures (from 600 to 800°C) and activation times (from 60 to 120 min.) was studied on the different answer variables analyzed. It was obtained that the resources and the activating agent used were appropriate to prepare activated carbons with a moderate adsorption capacity.